Pitamaha Bhishma on arrow bed
When Bhishma was struck down by arjun, thx to Govinda's kripa, he fell down from his chariot. But since the arrows had gone aar-paar, he did not touch the ground, but remained lying on the bed of arrows. His head was hanging, he needed to rest it, and told arjun to make some provision. arjun immediately stuck 3 arrows beneath hi shead to support it. Bhishma remarked joyfully - "What a fitting pillow for a warrior like me - a pillow to match the bed !". Next he asked for water, since he was thirsty. The third Pandav once, more, struck a mighty arrow right through the earth, and Ganga maiya surged up to pour cool water in the parched mouth of her beloved son. The blue color pipe you see, denotes the flow of Ganga-jal.